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Conference on Lasers and Electro-Optics

Two-Photon Interference for Quantum Cryptography with a Non-Maximally Entangled Photon Pair

Kaoru Shimizu, Hiroki Takesue, Kiyoshi Tamaki

Published Jan 1, 2009• 0 citations
Publisher

Abstract

This paper proposes a novel scheme of quantum cryptography with the two-photon interference of a non-maximally entangled photon pair. The security is based on the impossibility of the local unitary transformation between the certain non-maximally entangled states.
DOI
10.1364/iqec.2009.iwc6

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This paper proposes a scheme for quantum cryptography with a nonmaximally entangled qubit pair. In a two-way configuration similar to quantum super dense coding, a two-bit key can be distributed by a round trip of one particle of the qubit pair and received by an appropriate joint measurement with the other. The security of our scheme is based on the quantum-mechanical impossibility of local unitary transformation between certain nonmaximally entangled states. Although an eavesdropper, Eve, can always identify the quantum state and intercept the key, it is impossible for her to resend the state with a unity probability and the legitimate parties inevitably detect her. Our protocol is also capable to quantum secure direct communication.
Quantum cryptography is an active field of modern computer science.Quantum information hiding is an important problem in quantum cryptography.The scheme based on the non-locality of non-maximally entangled states in a two-particle quantum system.Involves coding information in a integral state of the two-particle system in which the two particles are distributed to two persons who are only allowed to perform local operations and classical communications so that the origin information is hidden and it's impossible for two persons to recover it.This paper provides a quantum data hiding scheme using non-maximally entangled states.It's easier to carry out in relative to schemes using maximally entangled states.It is shown that the protocol is more secure and tends to offer a detailed procedure to hide data in computers and the protocol may be useful to keeping secret in network.
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